Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Debt Debt, Senior Notes (Details) - USD ($) $ in Millions	6 Months Ended
Debt Debt, Senior Notes (Details) - USD ($) $ in Millions	Jun. 30, 2016	May 09, 2016
6.375% Senior Notes Due 2024 [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument
Debt Instrument, Redemption Price, Percentage	4.781%
6.375% Senior Notes Due 2024 [Member] \| Debt Instrument, Redemption, Period Two [Member]
Debt Instrument
Debt Instrument, Redemption Price, Percentage	3.188%
6.375% Senior Notes Due 2024 [Member] \| Debt Instrument, Redemption, Period Three [Member]
Debt Instrument
Debt Instrument, Redemption Price, Percentage	1.594%
6.125% Senior Notes due 2021 [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument
Debt Instrument, Redemption Price, Percentage	4.594%
6.125% Senior Notes due 2021 [Member] \| Debt Instrument, Redemption, Period Two [Member]
Debt Instrument
Debt Instrument, Redemption Price, Percentage	3.063%
6.125% Senior Notes due 2021 [Member] \| Debt Instrument, Redemption, Period Three [Member]
Debt Instrument
Debt Instrument, Redemption Price, Percentage	1.531%
6.125% Senior Notes due 2021 [Member]
Debt Instrument
Debt Instrument, Face Amount		$ 250
Existing Senior Notes	$ 550
6.125% Senior Notes due 2021 [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument
Debt Instrument, Redemption Price, Percentage	106.125%
Debt Instrument, Redemption Price, Percentage of Principal Amount that can be redeemed	35.00%
6.375% Senior Notes Due 2024 [Member]
Debt Instrument
Debt Instrument, Face Amount		$ 450
6.375% Senior Notes Due 2024 [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument
Debt Instrument, Redemption Price, Percentage	106.375%
Debt Instrument, Redemption Price, Percentage of Principal Amount that can be redeemed	35.00%